I'm currently doing some repairs on a Cub that needed a new instrument panel. The only one on hand was too large so it was placed in the flat bed scanner and the image sent to Microsoft Paint where it was resized using the stretch/skew pull down utility and then printed, covered with package cellophane tape and fitted to dash panel.

To size, measure the length of panel needed and divide by the length of the panel being copied and place that number in MS Paint/image/stretch-skew/ horizontal and vertical percent box.